Pneumatic Connections - Garmin G3X Installation Manual

10.4.4 Pneumatic Connections

The following steps should be used to aid in the fabrication of pneumatic hose connections and in attaching
the aircraft pitot pressure source and aircraft static pressure source to the GSU 25.
CAUTION
If the AOA port is unused, connect it to the static port to avoid overpressuring (and
causing damage to) the internal AOA sensor.
CAUTION
When the aircraft is connected to a pitot-static tester, such as during the Part 43
Appendix E altimeter tests, the pitot and AOA ports must be covered by a pitot
adapter that is controlled by the pitot-static tester. Failure to do this will result in
overpressuring (and causing damage to) the internal airspeed and AOA sensors.
NOTE
Use of different colored tubing is recommended for static, pitot, and AOA plumbing to
avoid plumbing connection errors. Incorrect plumbing connections will result in
erroneous air data information calculated by the GSU 25.
Observe the following cautions when connecting pneumatic lines:
1. Make sure the aircraft static pressure port is plumbed directly to the unit static pressure input port
and the aircraft pitot pressure port is plumbed directly to the unit pitot pressure input port. The
AOA port must be plumbed directly to the AOA pressure port or, if unused, directly to the aircraft
static port.
2. Seal the threads of pneumatic fittings at the connector ports. Use caution to ensure there are no
pneumatic leaks.
3. Use care to avoid getting fluids or particles anywhere within the pneumatic lines connected to the
GSU 25.
The installer must fabricate any additional mounting equipment needed. Use outline and installation
drawings Figure B-8.1 and
G3X Installation Manual - GSU 25 Installation
Page 10-6
Figure B-8.2 for reference.
190-01115-01
Rev. L